The developers of SpamAssassin 3.0 said that the scores of the new version were intended to be a little less aggressive, because they were worried about too many false positives in the 2.0 version.

If you do not share this concern about false positives, decrease the required score. NoSpamToday! now ships with a default required score setting of 4.8 (compared to 5.0 in the SpamAssassin distribution).

Some people reduce the score to as low as 3.0, while others find 5.0 still too aggressive.